Reinforced concrete box culvert anti-corrosion structure in saline soil area

Abstract

The corrosion-resistant structure of the reinforced concrete box culvert in the saline soil area comprises a conventionally-designed reinforced concrete box culvert structure, the whole body of the reinforced concrete box culvert structure is wrapped with filament machine-woven composite geotechnical cloth (two pieces of cloth and one film), and the salt-isolating and water-blocking effects are achieved; the inner wall of the reinforced concrete structure is also in a closed environment, so that the reinforced concrete structure is effectively prevented from being permeated and corroded for a long time due to chemical reaction of the salinized soil, the problem of secondary salinization diseases of the roadbed is thoroughly solved, the construction is convenient, the manufacturing cost is low, and better economic benefits and social benefits are achieved; and the method has a wide application prospect in the fields of roads, municipal administration, airport pipelines and the like in salinized soil areas.

Description

technical field [0001] The invention relates to professional culverts for highways, municipalities, airports, etc., in particular to an anti-corrosion structure of a reinforced concrete box culvert in a saline soil area. Background technique [0002] Culverts refer to structures set up for drainage and pipeline passage in the construction of highways and municipal projects. The main forms of culverts are pipe culverts, slab culverts, reinforced concrete box culverts and stone arch culverts. [0003] Existing reinforced concrete box culverts often have corrosion damage in saline soil areas, the main reasons: 1, cl- is the main cause of steel bar corrosion, and the saline soil areas containing cl- will corrode the steel bars. The high alkalinity of cement hydration produces a dense passivation film on the surface of the steel reinforcement in the concrete. Cl- is a very strong depassivating agent. Cl- is adsorbed on the local passivation film, so that the pH value of the pla...

AI Technical Summary

Problems solved by technology

2. Chemical corrosion in the engineering environment can form calcium chloride and gypsum, which are soluble in water, resulting in increased leaching of concrete, and then increased strength and quality loss

4. The freeze-thaw cycle reduces the strength of the concrete structure and causes swelling and detachment damage

[0004] Corrosion of reinforced concrete box culverts will damage the concrete structure of the culvert, reduce the strength, deteriorate the stability, and even cause water leakage in the culvert, greatly shortening the service life of the culvert, or even destroying the culvert.

At present, the corrosion of reinforced concrete box culverts has not yet attracted enough attention from the transportation and municipal departments. When culvert corrosion occurs, only temporary maintenance methods such as crack repair and reinforcement can be used, and no fundamental protection against salt and water is taken.

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